Effect of Prewelding Pretreatment on Welding Residual Stress of Titanium Alloy Thick Plate

doi:10.11900/0412.1961.2024.00054

IMR OpenIR

	Effect of Prewelding Pretreatment on Welding Residual Stress of Titanium Alloy Thick Plate
	Zhou Mu 1,2; Wang Qian 2; Wang Yanxu 3; Zhai Zirong 4; He Lunhua 5,6; Li Bing 3; Ma Yingjie 1,2; Lei Jiafeng 1,2; Yang Rui 1,2
通讯作者	Wang Yanxu(yxwang@imr.ac.cn) ; Ma Yingjie(yjma@imr.ac.cn)
	2024-08-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:8 页码:1064-1078
摘要	Welding is an essential means of joining structural components to form a new structure. Welding residual stress mainly results from materials expanding or contracting due to temperature variations, which can reduce the life of titanium alloys. Therefore, to reduce undesired residual stress, the welding process and microstructure of the materials involved should be optimized. Titanium alloys play a crucial role in marine and aviation fields due to their excellent corrosion resistance and high specific strength. This work investigates the influence mechanism of the prewelding pretreatment process on the structure, mechanical properties, and residual stress of the electron beam welding joint of a titanium alloy thick plate. The macrostructure and microstructure of titanium alloy welding joints prepared using different pretreatment processes are characterized. Results showed that preheating before welding substantially widens the fusion zone (FZ) and heat-affected zone (HAZ) of the welding joint, coarsening a lamellae in both zones. Thus, the hardness of the FZ and HAZ of the preheated welding joint is reduced to close to that of the base metal. Simultaneously, the strength and toughness of the welding joint is considerably improved such that it is similar to the base metal. The neutron diffraction, deep-hole drilling, and RostenthalNorton contour methods are used to measure the residual stress of the electron beam welding joint. The neutron diffraction method exhibits high detection accuracy and can achieve stress monitoring in different zones of the weld seam. Deep-hole drilling is a mechanical strain relief technique for measuring transverse and longitudinal residual stress through component thickness. The Rostenthal-Norton contour method can obtain a three-dimensional stress on the welding joint. A combination of these three measurement techniques can complement and be used to verify each other, providing reasonable data for the residual stress evaluation. The detection results of unpreheated welding joints are compared and analyzed, and the residual stress distribution in the FZ and HAZ zones along different directions is obtained. The FZ is subjected to tensile residual stress along all three directions. Alternatively, the HAZ is subjected to compressive stress along the transverse and longitudinal directions and tensile stress along the normal direction. The residual stress at base metal is small. Additionally, the residual stress results obtained by the deep-hole drilling method for the welding joints using two preheating processes are compared. The results showed that preheating before welding can considerably reduce residual stress at the weld. The reason is discussed in depth. Numerical simulation is used to calculate the changes in the temperature and stress fields under different preheating temperatures. The dynamic change rules of thermal stress under different preheating temperatures are obtained. Results showed that increasing the preheating temperature reduces thermal stress and the thermal expansion mismatch in different areas of the welded joint. Moreover, the microstructure, element distribution, and grain orientation of the FZ and HAZ of joints welded using two pretreatment processes are analyzed. Preheating coarsens the a lamellae and promotes the redistribution of alloy elements, thereby reducing the stress concentration between a and beta phases. Besides, variant selection of the HAZ is induced by the preheating process. The number and differences in the orientation of a variants are decreased, thereby reducing the stress concentration between variants.
关键词	titanium alloy residual stress neutron diffraction microstructure mechanical property
DOI	10.11900/0412.1961.2024.00054
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001281277300006
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189573
专题	中国科学院金属研究所
通讯作者	Wang Yanxu; Ma Yingjie
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.ShanghaiTech Univ, Ctr Adapt Syst Engn, Shanghai 201210, Peoples R China 5.Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China 6.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhou Mu,Wang Qian,Wang Yanxu,et al. Effect of Prewelding Pretreatment on Welding Residual Stress of Titanium Alloy Thick Plate[J]. ACTA METALLURGICA SINICA,2024,60(8):1064-1078.
APA	Zhou Mu.,Wang Qian.,Wang Yanxu.,Zhai Zirong.,He Lunhua.,...&Yang Rui.(2024).Effect of Prewelding Pretreatment on Welding Residual Stress of Titanium Alloy Thick Plate.ACTA METALLURGICA SINICA,60(8),1064-1078.
MLA	Zhou Mu,et al."Effect of Prewelding Pretreatment on Welding Residual Stress of Titanium Alloy Thick Plate".ACTA METALLURGICA SINICA 60.8(2024):1064-1078.